AP3031A

Data Sheet WHITE LED STEP-UP CONVERTER General Description The AP3031A is an inductor-based DC/DC boost converter designed to drive LED arrays. 1.2A switching current allows AP3031A to be used in series 10 LEDs application typically. A constant frequency 1MHz PWM control scheme is employed in this IC, which means tiny external components can be used. Specifically, 1mm tall 22µH inductor and 0.47µF output capacitor for the typical application is sufficient. The over output voltage protection is equipped in AP3031A, which protects the IC under open load condition. The AP3031A includes UVLO, soft-start, current limit and OTSD to protect the circuit. The AP3031A is available in standard SOT-23-6 package. AP3031A Features · · · · · · · · · Fast 1MHz Switching Frequency Wide Input Voltage Range: 2.7V to 16V Low 200mV Feedback Voltage Output Over Voltage Protection:36V Cycle by Cycle Current Limit: 1.2A Built-in Soft-start Built-in Standby Mode to Achieve High Frequency PWM Dimming Built-in Thermal Shutdown Function Under Voltage Lockout Applications · · · · Digital Photo Frame GPS Receiver EPC PDVD SOT-23-6 Figure 1. Package Type of AP3031A May 2009 Rev. 1. 1 1 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Pin Configuration K Package (SOT-23-6) Pin 1 Dot by Marking AP3031A SW GND FB 1 2 3 6 5 4 VIN OV CTRL Figure 2. Pin Configuration of AP3031A (Top View) Pin Description Pin Number 1 2 3 Pin Name SW GND FB Ground Pin Voltage Feedback Pin. Reference voltage is 200mV Enable and Dimming Control Pin. Connect to a high input to enable the IC or a low input to disable the IC. If logic low time is more than about 0.7ms and then enable the IC, the AP3031A will soft start to protect system departments. If logic low time is less than about 0.7ms and then enable the IC, the AP3031A will hold on standby mode and start directly to achieve high frequency dimming Over-voltage Protection Input Pin. Connect to the output directly. On OVP condition, the output voltage will be clamped Input Supply Pin. Must be locally bypassed Function Switch Pin. Connect external inductor and Schottky 4 CTRL 5 6 OV VIN May 2009 Rev. 1. 1 2 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Functional Block Diagram FB SW SOFT START OV AP3031A 3 1 5 DRIVER OV VIN 6 V REF 1 .25 V 200 mV A1 A2 COMPARATOR CONTROL LOGIC OVER TEMPERATURE DETECTOR Q1 Σ CTRL 2 4 STANDBY To Control Logic RAMP GENERATOR GND 1 MHz OSCILLATOR Figure 3. Functional Block Diagram of AP3031A Ordering Information AP3031A Circuit Type Package K: SOT-23-6 G1: Green TR: Tape and Reel Package SOT-23-6 Temperature Range -40 to 85oC Part Number AP3031AKTR-G1 GDH Marking ID Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. May 2009 Rev. 1. 1 3 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Absolute Maximum Ratings (Note 1) Parameter Input Voltage SW Voltage FB Voltage CTRL Voltage Thermal Resistance (Junction to Ambient, No Heat Sink) Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) ESD (Machine Model) ESD (Human Body Model) Symbol VIN VSW VFB VCTRL θJA TJ TSTG TLEAD Value -0.3 to 20 -0.3 to 38 -0.3 to 20 -0.3 to VIN 265 Unit V V V V oC/W AP3031A 150 -65 to 150 260 600 4000 oC o o C C V V Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Operating Temperature Range Input Voltage CTRL Voltage Symbol TOP VIN VCTRL Min -40 2.7 Max 85 16 16 Unit o C V V May 2009 Rev. 1. 1 4 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Electrical Characteristics (VIN=5.0V, VCTRL =5.0V, TA=25oC, unless otherwise specified.) Parameter Operating Voltage Feedback Voltage (Note 2) FB Pin Bias Current Quiescent Current Shutdown Quiescent Current Switching Frequency Maximum Duty Cycle Switch Current Limit Switch VCE Saturation Voltage Switch Leakage Current CTRL Pin Voltage CTRL Pin Bias Current OVP Voltage Soft-start Time Standby Time Thermal Shutdown VCTRL ICTRL VOVP tSS tSTB TOTSD Symbol VIN VFB IFB IQ ISHDN f DMAX ILIMIT VCESAT D=60% ISW=0.6A VSW=35V Active high Active low 40 55 36 300 0.7 160 1.8 0.5 72 µA V µs ms o AP3031A Conditions Min 2.7 Typ Max 16 Unit V mV nA mA µA MHz % A mV IOUT=20mA, TA=-40oC to 85oC 188 200 35 212 100 5.0 80 1.3 VFB=VIN, no switching VCTRL=0V 1.5 20 0.75 90 1.0 3.0 50 1 93 1.2 300 0.01 5 µA V C Note 2: The bold type specifications of full temperature range are guaranteed by design (GBD). May 2009 Rev. 1. 1 5 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.) AP3031A 2.5 88 Minimum Operating Voltage (V) 2.4 80 Efficiency (%) 2.3 72 2.2 64 56 L=22µH ILED=20mA 10 LEDs 2.1 48 4 8 12 16 2.0 -40 0 40 o 80 120 160 Input Voltage (V) Temperature ( C) Figure 4. Efficiency vs. Input Voltage Figure 5. Minimum Operating Voltage vs. Temperature 4.7 4.6 4.5 100 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 2 4 6 8 10 12 14 16 Shutdown Quiescent Current (µA) Quiescent Current (mA) 80 60 TA=--40 C TA= 25 C TA= 85 C o o o TA=-40 C TA=25 C 40 4 8 12 o o o TA=85 C 16 Input Voltage (V) Input Voltage (V) Figure 6. Quiescent Current vs. Input Voltage Figure 7. Shutdown Quiescent Current vs. Input Voltage May 2009 Rev. 1. 1 6 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (Continued) (WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.) AP3031A 2.0 200 1.6 CTRL Voltage (V) CTRL Current (µA) 150 1.2 100 0.8 50 0.4 -50 0 0 50 100 o 150 0 4 8 12 16 Temperature ( C) CTRL Voltage (V) Figure 8. CTRL Pin Voltage vs. Temperature Figure 9. CTRL Current vs. CTRL Voltage 220 1.4 Feedback Voltage (V) 210 1.2 Frequency (MHz) ILED=20mA 200 1.0 190 0.8 180 -40 0 40 80 o 0.6 120 -40 0 40 o 80 120 160 Temperature ( C) Temperature ( C) Figure 10. Feedback Voltage vs. Temperature Figure 11. Frequency vs. Temperature May 2009 Rev. 1. 1 7 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (Continued) (WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.) AP3031A 40 1.2 38 1.1 OVP Voltage (V) Frequency (MHz) 36 1.0 34 0.9 32 0.8 30 -40 0 40 o 0.7 80 120 160 4 8 12 16 Temperature ( C) Input Voltage (V) Figure 12. OVP Voltage vs. Temperature Figure 13. Frequency vs. Input Voltage 700 70 65 Switch Saturation Voltage (mV) 600 60 o 500 Case Temperature ( C) 55 50 45 40 35 30 25 400 300 200 100 -40 C o 25 C o 85 C 0.2 0.4 0.6 0.8 1.0 o VOUT=10V 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 0 0.0 Switch Current (A) Output Current (mA) Figure 14. Switch Saturation Voltage vs. Switch Current Figure 15. Case Temperature vs. Output Current May 2009 Rev. 1. 1 8 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Typical Application AP3031A VIN 5V CIN 10 µF On/Off L 22 µH D VOUT 10 LEDs VIN SW OV CTRL AP3031A GND FB COUT 0.47µF R ISET Figure 16. Typical Application of AP3031A (10 WLEDs Series) May 2009 Rev. 1. 1 9 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Mechanical Dimensions SOT-23-6 Unit: mm(inch) AP3031A 2.820(0.111) 3.020(0.119) 0.300(0.012) 0.400(0.016) 0.300(0.012) 0.600(0.024) 0° 8° 0.200(0.008) 6 2.650(0.104) 2.950(0.116) 5 4 Pin 1 Dot by Marking 1 2 3 0.700(0.028)REF 0.950(0.037)TYP 1.800(0.071) 2.000(0.079) 0.000(0.000) 0.100(0.004) 0.100(0.004) 0.200(0.008) 1.050(0.041) 1.050(0.041) 1.150(0.045) 1.250(0.049) May 2009 Rev. 1. 1 10 1.500(0.059) 1.700(0.067) BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. 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